274 



University of California Publications. 



[Geology 



and further data are lacking. This species has been referred to 

 Linthia rather than to Schizaster on account of the more central 

 position of the apical system. 



Dimensions: Maximum width 14 mm.; maximum length 19 

 mm. ; maximum thickness 7 mm. 



Occurrence: In Contra Costa County, California, about one 

 mile west of Bear Valley in the lowest member of the Monterey 

 series. 



SCHIZASTEE(?) STALDEKI, n. sp. 

 PI. 21, fig. 3. 



Test distinctly cordate in form, with all of the petals deeply 

 sunken. The depression of the anterior petal deeply notches the 

 anterior margin. The petals of the bivium are very short. The 

 mouth-opening is situated very far forward. The anal opening 

 is not shown. As all of the known specimens are casts, the 

 nature of the plates of the test is only imperfectly shown. 



Dimensions : Maximum length 30.5 mm. ; maximum width 

 28 mm. 



Occurrence : This species is represented by a small series of 

 specimens obtained by Mr. Walter Stalder in Humboldt County, 

 California, in beds presumed to represent the Wild Cat series of 

 Lawson. 



Issued December 28, 1908. 



